Threshing cylinder

Abstract

To provide a threshing cylinder capable of smoothly carrying out threshing treatment of crops.SOLUTION: A combine harvester includes a raking part 30 for raking charged crops toward the rear of a threshing chamber, the raking part 30 including a base part 32 and a plurality of spiral blades 33 provided on the outer peripheral part of the base part 32, and a threshing treatment part including a plurality of rod-like threshing tooth support members 40 supported by a threshing cylinder support shaft 22 at equal intervals in the circumferential direction of the threshing treatment part. The number of the plurality of spiral blades 33 is equal to or less than half the number of the plurality of trailer tooth support members 40, the trailer position 33r of the spiral blade 33 is provided so as to be the same as the front end position of the threshing tooth support member 40 in the circumferential direction of the raking portion 30, and the start end position 33s of the spiral blade 33 is provided at a position facing the threshing position 33r of the spiral blade 33 with the threshing cylinder support shaft 22 interposed therebetween.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a threshing drum. [Background technology]

[0002] As shown in Patent Document 1, some threshing drums include a threshing drum support shaft rotatably mounted in a threshing chamber into which the entire harvested crop is dumped in a position along the front-to-rear direction of the threshing chamber, a sweeping section supported on the front of the threshing drum support shaft and sweeping the dumped crop toward the rear of the threshing chamber, and a threshing section supported on a section of the threshing drum support shaft rearward of the sweeping section and threshing the crop dumped by the sweeping section. Also, some threshing drums of this type include a sweeping section equipped with a base and spiral blades provided on the outer periphery of the base, and a threshing section equipped with a plurality of rod-shaped threshing tooth support members supported on the threshing drum support shaft in a state aligned with the threshing drum support shaft and spaced apart in the circumferential direction of the threshing section, and a plurality of rod-shaped threshing teeth supported on the threshing tooth support member in a state that protrudes radially outward from the threshing section and is spaced apart in the direction along the threshing drum support shaft. At least one of the treating tooth support members is provided so that the front end position of the treating tooth support member is the same as the terminal end position of the helical blade in the circumferential direction of the raking portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-067434 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described threshing drum, the threshing tooth support member and the raking section are connected, and the harvested crop is transferred from the raking section to the threshing section.

[0005] However, when harvesting crops with long stems, the harvested crops tend to get tangled in the raking section and are not smoothly delivered to the threshing section, resulting in stagnation. This can lead to clogging or backflow in the threshing drum, which can reduce the efficiency of threshing in the threshing drum.

[0006] An object of the present invention is to provide a threshing drum that can smoothly thresh crops. [Means for solving the problem]

[0007] A characteristic configuration of the present invention is that it comprises a threshing drum support shaft rotatably provided in a threshing chamber into which the entire harvested crop is thrown in, in an orientation along the front-to-back direction of the threshing chamber; a sweeping section supported on the front of the threshing drum support shaft and sweeping the thrown crop toward the rear of the threshing chamber; and a threshing processing section supported on a portion of the threshing drum support shaft rearward of the sweeping section and threshing the crop scraped in by the sweeping section, wherein the sweeping section comprises a base section and a plurality of spiral blades provided on the outer periphery of the base section, and the threshing processing section is supported by the threshing drum support shaft in a state in which the spiral blades are aligned with the threshing drum support shaft and are evenly spaced apart in the circumferential direction of the threshing processing section. The device is provided with a plurality of rod-shaped threshing tooth support members, and each of the plurality of threshing tooth support members has a plurality of threshing teeth that protrude from the threshing tooth support member radially outward of the threshing processing section and are supported by the threshing tooth support member with spaces between them in a direction along the threshing drum support shaft, the number of the plurality of helical blades is less than half the number of the plurality of threshing tooth support members, the terminal positions of the helical blades are arranged so as to be the same as the front end position of the threshing tooth support member in the circumferential direction of the scraping section, and the starting end position of the helical blades is arranged in a position opposite to the terminal position of the helical blade across the threshing drum support shaft.

[0008] The outer ends of the spiral blades press the harvested crop against the inner wall of the threshing chamber. As the raking section rotates, the crop slides backward against the inner wall of the threshing chamber and is delivered to the threshing section at the rear end of the raking section. That is, the crop is raked backward at the start of the raking section and delivered to the threshing section at the end of the raking section.

[0009] For example, when viewed from the side, if the outer end of the spiral blade is inclined relatively gently relative to the horizontal plane, the crop is raked in relatively linearly relative to the direction of the raking section. As a result, the outer end of the spiral blade does not provide sufficient frictional force to the crop, making it more likely to come off the outer end of the spiral blade. In other words, the crop is not raked in all the way to the rear end of the raking section, resulting in poor raking efficiency.

[0010] Furthermore, for example, if the inclination of the outer end of the spiral blade relative to the horizontal plane is relatively steep in side view, the feed width of the crop per rotation of the raking section will be small, which will result in poor raking efficiency at the raking section.

[0011] According to this configuration, the inclination of the outer end of the spiral blade relative to the horizontal plane tends to be appropriate when viewed from the side.

[0012] This allows sufficient friction to be applied to the crops against the outer ends of the helical blades, allowing the crops to be scraped in without coming off the helical blades.

[0013] Furthermore, as the number of spiral blades in the sweeping section increases, the amount of crops delivered to the threshing section per rotation of the sweeping section increases.

[0014] On the other hand, if there are too many spiral blades, they may act as a physical barrier when scraping the crop backward, reducing the amount of crop that is handed over.

[0015] According to this configuration, the number of spiral blades is less than half the number of the threshing tooth support members, so the raking action is not excessive, and it is possible to prevent excessive accumulation of crops inside the threshing section.

[0016] In addition, according to this configuration, the terminal end of the spiral blade is positioned to be the same as the front end of the threshing tooth support member in the circumferential direction of the raking section, so that crops delivered to the threshing section can be immediately threshed by the threshing tooth support member.

[0017] As described above, this configuration allows crop threshing to be carried out smoothly.

[0018] In the present invention, it is preferable that the position of the start end of the spiral blade is set to be the same as the position of the front end of the treating tooth support member in the circumferential direction of the raking portion.

[0019] The start end of the spiral blade is prone to receive large pressure from the crop. For this reason, a reinforcing member is sometimes provided at the start end to ensure rigidity. However, the reinforcing member tends to make the start end of the spiral blade heavier.

[0020] In order to rotate the handling drum stably, it is desirable to place the center of gravity of the handling drum in the center (on the rotation axis). In order to place the center of gravity of the handling drum in the center, it is necessary to devise the arrangement of each heavy object on the handling drum.

[0021] The heavy objects mainly include the starting end of the spiral blade and the handling tooth support member.

[0022] According to this configuration, the start end positions of the helical blades and the threshing tooth support members are aligned. The threshing tooth support members are also evenly spaced around the circumferential direction of the threshing section. By aligning the start end positions of the helical blades with the threshing tooth support members, it becomes easier to evenly space the start end positions of each helical blade around the circumferential direction. In other words, it becomes easier to center the center of gravity of the threshing drum.

[0023] In the present invention, it is preferable that the starting end position of the helical blade does not overlap with any portion other than the starting end position of the helical blade in a front view.

[0024] If the starting end position of the spiral blade overlaps with a part other than the starting end position of the spiral blade when viewed from the front, the scraping portion must rotate more than once in order to scrape the crop from the starting end position of the spiral blade to the terminal end position.

[0025] Furthermore, the narrower the spacing between the spiral blades, the more likely they are to act as a physical barrier to the raking of crops, resulting in poor raking efficiency.

[0026] With this configuration, the helical blade can quickly deliver the crop to the threshing section, which increases the raking efficiency of the raking section compared to when the starting end of the helical blade overlaps with a portion other than the starting end of the helical blade in a front view.

[0027] In the present invention, it is preferable that the threshing section has six of the threshing tooth support members, and the raking section has three of the helical blades.

[0028] As with the spiral blades, if there are too many threshing tooth support members, the crops will be more likely to become tangled, which may cause clogging or backflow in the threshing drum.On the other hand, if there are too few threshing tooth support members, the threshing efficiency will decrease.

[0029] With this configuration, the six threshing tooth support rods are spaced apart at an angle of 60 degrees from each other relative to the threshing drum support shaft, which provides ample space between the threshing tooth support rods, preventing clogging and backflow and achieving high threshing efficiency.

[0030] In the present invention, it is preferable that the sweeping portion has three or less of the spiral blades.

[0031] If there are too many blades, the spacing between the blades in the front-to-rear direction will be too small, which can lead to crop blockage and backflow.

[0032] According to this configuration, the sweeping section has three or less helical blades, which ensures sufficient spacing between the helical blades in the front-to-rear direction, preventing crops from clogging or flowing back. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is a side view showing the entirety of a normal combine harvester. [Figure 2] FIG. [Figure 3] This is a longitudinal rear view of the threshing drum at the rear of the threshing drum's raking portion. [Figure 4] FIG. [Figure 5] FIG. 2 is a development view of the part of the threshing drum where the rear part of the raking section and the front part of the threshing processing section are located. DETAILED DESCRIPTION OF THE INVENTION

[0034] An embodiment of the present invention will be described below with reference to the drawings. In the following description, the direction of the arrow F shown in Figure 1 will be referred to as the "forward direction of the machine body," the direction of the arrow B as the "rearward direction of the machine body," the direction of the arrow U as the "upward direction of the machine body," the direction of the arrow D as the "downward direction of the machine body," the direction toward the front of the page as the "leftward direction of the machine body," and the direction toward the back of the page as the "rightward direction of the machine body."

[0035] [Overall view of a conventional combine harvester] As shown in FIG. 1, a full-type combine harvester includes a body frame 1 made by connecting multiple steel materials, such as square pipes, and a traveling machine body with a pair of crawler-type traveling devices 2 attached to the bottom of the body frame 1. A driver's section 4 and a harvesting and transporting device 6 are provided at the front of the traveling machine body (the front of the machine body). The driver's section 4 is equipped with a driver's seat 3. The harvesting and transporting device 6 includes a harvesting section 8 attached to the front of the harvesting and transporting device 6, which uses a clipper-type reaping device 7 to cut and harvest stalks of rice or other crops planted in the field, and a transporting device 9 attached to the rear of the harvesting and transporting device 6, which transports the crops harvested by the harvesting section 8 to a predetermined location on the traveling machine body. A threshing device 10 is attached to the rear of the traveling machine body, which receives the crops transported by the transporting device 9, threshers them, and sorts the threshed crops after threshing. A grain tank 11 is also provided for collecting and storing the grains obtained by the threshing device 10. The threshing device 10 and the grain tank 11 are arranged side by side. A grain discharge device 12 that discharges grains from the grain tank 11 is connected to the rear of the grain tank 11.

[0036] [Configuration of the transport device] 1 and 2, the conveying device 9 includes a conveying case 13 extending from the rear of the harvesting unit 8 to the front of the threshing device 10. An endless rotating belt 14 is provided inside the conveying case 13 and is rotatably mounted between the lower and upper parts of the conveying case. The endless rotating belt 14 is provided with locking conveying sections 14a at multiple locations along its length.

[0037] In the conveying device 9, the engaging conveying part 14a is transported by the endless rotating belt 14. The crops from the harvesting section 8 are engaged and conveyed inside the conveying case 13 by the engaging conveying part 14a and thrown into the raking section 30 provided at the front of the handling drum 21.

[0038] The crops are pressed against the lower interior side of the transport case 13 by the engaging transport part 14a and slide. That is, the crops slide under the endless rotating belt 14 and inside the transport case 13, and are thrown into the raking part 30.

[0039] [Configuration of threshing device] As shown in Figure 2, the threshing device 10 comprises a threshing section 10A provided at the top of the threshing device 10, and a sorting section 10B provided below the handling chamber 20 in the threshing section 10A. In the threshing device 10, the threshing direction in the threshing section 10A coincides with the front-to-rear direction of the traveling machine body, and the upstream side of the threshing direction is set to be located at the front side of the traveling machine body.

[0040] As shown in FIG. 2, the threshing section 10A includes a threshing chamber 20 formed at the top of the threshing device 10. A threshing drum 21 is provided in the threshing chamber 20. The threshing drum 21 is driven to rotate clockwise as viewed from the front (indicated by arrow X in FIG. 3) around a threshing drum support shaft 22, which is rotatably mounted in a position along the front-to-rear direction of the threshing chamber 20. A feed opening 23 is formed at the front lower part of the threshing chamber 20, allowing crops to be fed into the threshing chamber 20. A dust discharge opening 24 is formed at the rear lower part of the threshing chamber 20, allowing threshed straw, broken straw, and other threshed products to be discharged outside the threshing chamber. A receiving net 25 is provided around the lower part of the threshing drum 21 (the area below the threshing drum 21 within the periphery of the threshing drum 21). The receiving net 25 is configured in a concave shape.

[0041] The threshing chamber 20 is formed by a front support wall 26 and a rear support wall 27 that support the threshing drum 21, a top plate 28 provided above the threshing drum 21, and a receiving net 25. A plurality of dust discharge valves 29 are provided inside the top plate 28 and aligned in the front-to-rear direction of the threshing chamber 20. As shown in Figure 2, the threshing drum 21 is equipped with a sweeping section 30 provided at the front of the threshing drum 21 for sweeping the crops to be threshed toward the rear of the threshing chamber 20, and a threshing processing section 31 provided at a portion of the threshing drum 21 behind the sweeping section 30 for threshing the crops to be threshed. The threshing processing section 31 is continuous with the rear of the sweeping section 30.

[0042] In the threshing section 10A, the entire stalk of the crop, from the base to the tip, which is fed into the front of the threshing chamber 20 by the engaging conveying section 14a of the conveying device 9 through the supply port 23, is raked in as threshing material by the raking section 30 toward the rear of the threshing drum 21 and threshed by the threshing section 31 and receiving net 25. The threshing material is given a rotational force by the rotating threshing section 31, hits the dust discharge valve 29, and is guided by the dust discharge valve 29 to flow toward the rear of the threshing chamber 20. The threshing material is threshed while being transported toward the rear of the threshing chamber 20 by the threshing section 31. Grains obtained through the threshing process leak through the receiving net 25. The threshing material, such as threshed stalks and straw scraps, generated during the threshing process is discharged outside the threshing chamber 20 through the dust discharge port 24.

[0043] [Structure of the handling drum] 2, the threshing drum 21 is provided in the handling chamber 20 in a position that follows the front-to-rear direction of the handling chamber 20. The threshing drum 21 is provided with a threshing drum support shaft 22 that is provided in the handling chamber 20 in a position that follows the front-to-rear direction of the handling chamber 20 and is driven to rotate around a threshing drum axis P as the center of rotation, a pick-up section 30 that is supported at the front of the threshing drum support shaft 22, and a threshing processing section 31 that is supported by the threshing drum support shaft 22 and is continuous with the rear of the pick-up section 30.

[0044] [Configuration of the scraping section] As shown in FIG. 2, the sweep section 30 includes a base 32 supported on the front portion of the threshing drum support shaft 22 and a spiral blade 33 extending from the outer periphery of the base 32 toward the outside in the radial direction of the threshing drum. In this embodiment, the base 32 is formed from a sheet metal member wound into a truncated cone shape, tapering toward the front end of the threshing drum 21. The base 32 is supported by the threshing drum support shaft 22 by connecting the front end of the base 32 to the threshing drum support shaft 22 with a front circular plate member 37 and connecting the rear end of the base 32 to the threshing drum support shaft 22 with a first intermediate circular plate member 35. Three spiral blades 33 are arranged in parallel, forming a triple spiral.

[0045] The front disk member 37 rotates integrally with the sweeping portion 30. In this embodiment, the front disk member 37 is attached to the front end portion of the base portion 32, but the front end portion of the base portion 32 may be configured in a disk shape.

[0046] 2, a guide section 34 is provided below the raking section 30 to guide the crops from the supply port 23 to the raking section 30. The guide section 34 is provided with a downward inclination at the front.

[0047] In the raking section 30, the base section 32 is driven by the threshing drum support shaft 22 via the front disc member 37 and the first middle disc member 35, and the triple spiral blades 33 are driven to rotate around the threshing drum axis P. The entire stalk of the crop, from the base to the tip, is introduced into the front of the threshing chamber 20 through the supply port 23 by the locking conveying section 14a of the conveying device 9 and is raked along the guide section 34 by the rotating spiral blades 33 toward the rear of the threshing drum 21.

[0048] 4, one of the three helical blades 33 is shown by a solid line and the remaining two are shown by virtual lines. As shown in Fig. 4, the helical blade 33 is provided on the outer periphery of the base part 32 from a start end position 33s to a terminal end position 33r. That is, the start end position 33s is the front end of the helical blade 33, and the terminal end position 33r is the rear end of the helical blade 33.

[0049] A treating tooth support member 40 is disposed behind the starting end position 33s of the helical blade 33. In other words, the starting end position 33s of the helical blade 33 is arranged so as to coincide with the front end position (the position of the front end 40f (see FIG. 5)) of the treating tooth support member 40 in the circumferential direction of the sweeping section 30.

[0050] The terminal end position 33r of the spiral blade 33 is positioned so as to be the same as the front end position of the handling tooth support member 40 (the position of the front end 40f (see Figure 5)) in the circumferential direction of the sweeping section 30, and the starting end position 33s of the spiral blade 33 is positioned opposite the terminal end position 33r of the spiral blade 33, across the handling drum support shaft 22.

[0051] In a front view, the helical blade 33 is provided over half the circumference of the outer periphery of the base portion 32. In other words, the starting end position 33s of the helical blade 33 does not overlap with any part of the helical blade 33 other than the starting end position 33s in a front view.

[0052] The radial width of the spiral blade 33 narrows toward the terminal end position 33r. The spiral blade 33 has a notch 33k on the terminal end position 33r side, which has an even narrower radial width. When the crop is raked in, the outer end of the spiral blade 33 presses the crop against the inner wall of the sweeping section 30. As the sweeping section 30 rotates, the crop slides between the inner wall of the sweeping section 30 and the outer end of the spiral blade 33, and is sweep into the rear of the handling chamber 20.

[0053] In Figure 4, L1 indicates the lower end of the rotational orbit of the helical blade 33 excluding the notch 33k when viewed from the front. L2 indicates the lower end of the rotational orbit of the notch 33k when viewed from the front. As shown in Figure 4, L2 is higher than L1. In other words, the lower end of the rotational orbit at the rear end of the helical blade 33 is higher than the lower end of the rotational orbit at the front side of the helical blade 33. Therefore, by having the notch 33k in the helical blade 33, a predetermined distance can be maintained between the rear end of the helical blade 33 and the receiving net 25.

[0054] 2, the front end of the helical blade 33 is located near the front disk member 37, and the rear end of the helical blade 33 is located near the first intermediate disk member 35. In other words, the start end position 33s of the helical blade 33 is located near the front disk member 37, and the end end position 33r of the helical blade 33 is located near the first intermediate disk member 35.

[0055] [Configuration of the threshing processing unit] 2 and 3, the threshing section 31 is provided with a plurality of threshing tooth support members 40 that are supported by the threshing drum support shaft 22 and spaced apart from one another in the circumferential direction of the threshing drum 21. Each threshing tooth support member 40 is formed of a rod-shaped member that extends in a direction along the threshing drum axis P.

[0056] The number of the multiple helical blades 33 is half or less of the number of the multiple threshing tooth support members 40. More specifically, in this embodiment, the threshing drum 21 is provided with six threshing tooth support members 40 and three helical blades 33. In other words, the number of the helical blades 33 is half the number of the threshing tooth support members 40.

[0057] As shown in FIG. 5, the front end portion 40f of the treating tooth support member 40 is supported by the first inner disk member 35.

[0058] As shown in Figure 2, the front portion of the threshing tooth support member 40 is connected to the threshing drum support shaft 22 via the first intermediate disc member 35. The rear end portion of the threshing tooth support member 40 is supported by the rear disc member 36. The rear portion of the threshing tooth support member 40 is connected to the threshing drum support shaft 22 via the rear disc member 36. The portion of the threshing tooth support member 40 located between the front end portion 40f and the rear end portion is supported by the second intermediate disc member 41. The portion of the threshing tooth support member 40 located between the front end portion 40f and the rear end portion is connected to the threshing drum support shaft 22 via the second intermediate disc member 41.

[0059] With the above-described configuration, the threshing tooth support member 40 is supported by the threshing drum support shaft 22.

[0060] As shown in Figures 2, 3, and 5, the front end 40f of the threshing tooth support member 40 is supported on the first intermediate disc member 35 by connecting a bracket 43 provided on the front end 40f to the first intermediate disc member 35. The bracket 43 is connected to the first intermediate disc member 35 with a connecting bolt. The second intermediate disc member 41 is provided at multiple locations in the axial direction of the threshing drum support shaft 22. The threshing teeth 42 are erected on the threshing tooth support member 40, facing radially outward from the threshing drum 21. The threshing teeth 42 are erected from multiple locations on the threshing tooth support member 40 in the axial direction of the threshing drum 21. The threshing teeth 42 are composed of rod-shaped members. The threshing section 31 is configured in a cage shape.

[0061] In this embodiment, the handling teeth 42 are provided in a position that follows the radial direction of the handling drum 21, but they may also be provided in a position that is inclined relative to the radial direction of the handling drum 21, such as a position that is inclined toward the rear side.

[0062] In the threshing section 31, the threshing tooth support members 40 are driven by the threshing drum support shaft 22 via the first middle disc member 35, the second middle disc member 41 and the rear disc member 36, and the threshing teeth 42 are driven around the threshing drum axis P as the center of rotation. The material to be threshed moves between the inside and outside of the threshing drum 21 between the threshing tooth support members 40. As the material to be threshed moves, it is subjected to the threshing action of the threshing teeth 42 and the receiving net 25, and also to the threshing action caused by the impact of the threshing tooth support members 40, and is threshed.

[0063] In other words, the threshing drum 21 is configured as a cage-like shape with an internal space S1 (see Figure 2) formed inside that communicates with the threshing chamber 20 through the spaces between the threshing tooth support members 40, and is configured to have a plurality of threshing teeth 42 that protrude from the outer surface of the threshing drum 21 radially outward from the threshing drum 21, aligned at intervals in the circumferential direction of the threshing drum 21 and in the threshing processing direction, making it a so-called bar-shaped threshing drum.

[0064] Therefore, the threshing drum 21 rotates around the threshing drum support shaft 22 in the threshing direction as the center of rotation, thereby introducing the threshed material (crops) from the sweeping section 30 into the space between the threshing section 31 and the receiving net 25. The threshing drum 21 threshes the threshed material located in the threshing space S2 (see FIG. 2) between the threshing drum 21 and the receiving net 25 by striking the threshing material with the threshing tooth support member 40 and the threshing teeth 42 and combing the threshing teeth 42. The threshing drum 21 allows the threshing material obtained by this threshing process to enter the internal space S1, and while mixing the threshing material in the threshing space S2 with the threshing material in the internal space S1, threshing the threshing material by striking the threshing tooth support member 40 and the threshing teeth 42 and combing the threshing teeth 42.

[0065] In this embodiment, the handling tooth support member 40 is made of round steel pipe material. In addition to round steel pipe material, various other rod-shaped materials such as round steel, square steel bar material, and square steel pipe material can be used for the handling tooth support member 40. In this embodiment, each handling tooth 42 is made of round steel material. In addition to round steel material, various other rod-shaped materials such as square steel bar material, round pipe material, and various other pipe materials can be used for the handling tooth 42.

[0066] 5, the treating tooth support member 40 is configured to be located between the terminal end positions 33r of adjacent helical blades 33 in the circumferential direction of the sweeping section 30. In this embodiment, only one treating tooth support member 40 is configured to be located between the terminal end positions 33r of adjacent helical blades 33.

[0067] [Configuration of the sorting section] As shown in Figure 2, the sorting section 10B is equipped with a swinging sorting device 45 that is provided below the receiving net 25 and can be swung, a winnowing machine 46 that is provided in front of and below the swinging sorting device 45, and a first collection section 47 and a second collection section 48 that are provided below the swinging sorting device 45 behind the winnowing machine 46. In this embodiment, the first collection section 47 and the second collection section 48 are constituted by screw conveyors that extend in the width direction of the threshing device 10.

[0068] In the sorting section 10B, the processed material that has leaked from the receiving net 25 falls into and is received by the oscillating sorting device 45, and the received processed material is shaken while being transported rearward by the oscillating sorting device 45, and is subjected to sorting processing by receiving sorting air that is supplied from the front below the oscillating sorting device 45 toward the rear of the oscillating sorting device 45 by the winnower 46. The clean grains obtained by the sorting process as the first processed material flow down and are collected in the first collection section 47, and are transported by the first collection section 47 to the outside, side of the grain tank 11 of the threshing device 10. The unprocessed grains obtained by the sorting process as the second processed material flow down and are collected in the second collection section 48, and are transported by the second collection section 48 to the outside, side of the grain tank 11 of the threshing device 10. The sorting dust such as straw dust as the third processed material generated by the sorting process is discharged from the dust discharge outlet 49 provided at the rear of the threshing device 10 together with the sorting wind to the rear of the threshing device 10.

[0069] The clean grains transported by the first collection section 47 are supplied to the grain tank 11 by a grain lifting device 50 connected to the first collection section 47. The unprocessed grains transported by the second collection section 48 are returned to the starting end of the oscillating sorting device 45 by a return device 51 connected to the second collection section 48.

[0070] [Another embodiment] (1) In the above embodiment, the start end position 33s of the helical blade 33 is located at the same position as the front end 40f of the treating tooth support member 40 in the circumferential direction of the sweeping portion 30, but this is not limitative. For example, the start end position 33s of the helical blade 33 may be located between the front end positions of the treating tooth support member 40 in the circumferential direction of the sweeping portion 30.

[0071] (2) In the above embodiment, the helical blade 33 is provided so as to extend over half the circumference of the sweeping portion 30 in a front view, but this is not limiting. For example, the helical blade 33 may be provided so as to extend over one or more circumferences of the outer periphery of the sweeping portion 30.

[0072] (3) In the above embodiment, an example was shown in which the number of the treating tooth support members 40 was six and the number of the helical blades 33 was three, but this is not limited to this. The number of the treating tooth support members 40 may be six or more, or six or less. Furthermore, the number of the helical blades 33 may be three or more, or three or less.

[0073] (4) The direction of the spiral blade 33 may be reversed in the raking section 30, and the threshing drum 21 may rotate in the direction opposite to the arrow X in FIG.

[0074] (5) The start end position 33s and the end end position 33r of the spiral blade 33 do not have to face each other. For example, the start end position 33s and the end end position 33r may be located at 120 degrees with respect to the axis P of the handling cylinder.

[0075] (6) In the above embodiment, the start position 33s and the front end of the helical blade 33 are configured to approximately coincide with each other, and the end position 33r and the rear end of the helical blade 33 are configured to approximately coincide with each other. However, they do not have to coincide with each other. The front end of the helical blade 33 may be located forward of the start position 33s, and the rear end of the helical blade 33 may be located rearward of the end position 33r. [Industrial Applicability]

[0076] The present invention can be applied to a threshing drum that includes a base portion, a raking portion having a spiral blade, and a plurality of threshing tooth support members. [Explanation of symbols]

[0077] 20: Handling room 21: Handling body 22: Handling trunk support shaft 30: Scraping section 31: Slicing processing section 32: Base part 33: Spiral blade 33r: End position 33s: Starting end position 40: Handle tooth support member 40f: Front end 42: Teeth treatment

Claims

1. A threshing drum support shaft is rotatably provided in a threshing chamber into which the entire harvested crop is thrown in, in a position along the front-to-rear direction of the threshing chamber; A scraping section supported on the front portion of the threshing body support shaft and raking the input crops toward the rear of the threshing chamber; A threshing processing section is provided, which is supported on a portion of the threshing drum support shaft that is rearward of the raking section and threshes the crop raked in by the raking section, The raking portion includes a base portion and a plurality of spiral blades provided on an outer periphery of the base portion, The threshing section is provided with a plurality of rod-shaped threshing tooth support members supported on the threshing drum support shaft in a state along the threshing drum support shaft and at equal intervals in the circumferential direction of the threshing section, and a plurality of threshing teeth supported on the threshing tooth support member in a state in which the threshing teeth protrude from the threshing tooth support member toward the radial outside of the threshing section and are spaced apart in the direction along the threshing drum support shaft, The number of the spiral blades is half or less of the number of the treating tooth support members, The terminal end position of the spiral blade is arranged to be the same as the front end position of the threshing tooth support member in the circumferential direction of the threshing portion, and the starting end position of the spiral blade is arranged in a position opposite to the terminal end position of the spiral blade across the threshing drum support shaft.

2. 2. The threshing drum according to claim 1, wherein the position of the start end of the spiral blade is set to be the same as the position of the front end of the threshing tooth support member in the circumferential direction of the raking portion.

3. 2. The threshing drum according to claim 1, wherein the starting end position of the spiral blade does not overlap with any portion other than the starting end position of the spiral blade in a front view.

4. The scraping processing section has six of the scraping tooth support members, The threshing drum according to claim 1 , wherein the raking portion has three of the spiral blades.

5. The threshing drum according to claim 1 , wherein the raking portion has three or less of the spiral blades.

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